The LR140 series utilizes the latest Low Power Wide Area (LPWA) technology to build Modbus/RTU communication for long-distance, wide-coverage, and low power consumption wireless IoT applications. Multiple analog inputs are supported in LR140 series, such as voltage, current and one RS-485 port for Modbus RTU Device connection. One LR140 can read more than 20 register entries from different field RTU devices in predefined time scheduling. The LoRaWAN wireless distance can reach up to 3-6KM distance depending on the environment. The LR140 series offers great flexibilities in wireless IoT applications, such as environmental sensors and meters reading for Smart City Applications such as Smart Farming, Smart Environment Monitor, etc.
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Modbus/RTU  to LoRaWAN

•Transmit RTU Data to LoRaWan Gateway
• Flexible RTU Device Address Settings
•Configurable Read Start Addresses
•Maximum 20 Entries for Time Schedule Report

Analog 4~20mA Input to
•2 Channels 0~10V High Impedance Input-  Luminance Sensing

Analog 0~10V Input to LoRaWan

•2 Channels Current Sensing, 0.2%High Accuracy

Windows© Configure Tools

•User-Friendly, Model Auto Detection
•Analog IO Parameter Configuration and Auto Display
•Micro-USB Configuration

Secured Radio Communication

•AES 128 Data Encryption
•Configurable Encryption Key – Modbus Register Writing

Industrial Application

•9~30V DC wide power range input
•Low Power Consumption
•Wide Coverage up to 6KM
•Max.250 LC144 Nodes to one LM100
•-40 ~ 75°C / 90%H  Operating Temperature / Humidity
•Compliance IEC 61000-6-2/-6-4 Heavy Industrial EMC

Wireless Specification
Frequency EU 433Mhz, EU 868Mhz, US915Mhz, AS 923Mhz, KR 920Mhz
Wireless Technology Low Power Wide Area – LoRa WAN Technology
Radio TX Power 22dBm
Radio RX Sensitivity - 148dBm, SF=12 @ 250bps
Spreading Factor SF5/SF6/SF7/SF8/SF9/SF10/SF12, Default SF7
Remote  Configurable by ModBus RTU / Register writing command
Demodulator SNR LoRa Demodulator Signal to Noise Ratio: -2.5dB ~ -20dB
Operating Mode RTU 485: Modbus protocol over the Air (LoRa WAN Transmission) with configurable RTU Device / Register  Address
Analog Input: Pre-defined  Current / Voltage interface
Forwarding Data Buffer 256Bytes FIFO Data Buffer for LoRa signal transmission
Data Encryption 128bits AES with configurable key
System Management 1 x Micro USB 2.0 port for system configuration
Software Utility Windows© Based  Utility
I/O Interface
Antenna Connector 1x 50 ohm, Female SMA
Serial Interface 2-wires RS-485 Terminal Connector with 1kv isolation
Connector Type: Removable Terminal Connector
Supported Model: LM-100 (Slave), LC-100(Host)
Serial Parameters Baud Rate: 1200bps, 4800bps, 9600bps,115,200bps
Data Bits: 8
Parity Check: None
Stop Bit: 1
CRC: Enable (default)
Current Input 2 Channels
Detection Range: 4-20mA
Accuracy Level: 0.3%
Voltage Input 2 Channels
Detection Range: 0~10 V
Accuracy Level: 0.2%
System Indication  
LED Power (On):  System Power applied
LoRa (Blinking): LoRa RF Signal on Communication
Power Requirement
Input Rating Typical DC 24V, Rating: 10~30V
3-Pins Removable Terminal Connector for V+ ,Com and Earth Ground
Reverse Protection Yes
Power Consumption LR140: 3 Watts @ DC 24V power input
Installation DIN Rail Mount
Enclosure Material UL94v0, ABS , Anti- U/V
Ingress Protection IP 40
Dimension 26(D) x 102.5 (H) x 72 mm (W)  / with wall mounting clip
Weight 115g
Operating Temperature -40°C~75°C, 0% ~ 90%, Non-Condensing
Storage Temperature -40°C~80°C, 0% ~ 90%, Non-Condensing
Reliability & Warranty
MTBF 20000> Hours
Warranty 3 Years, No-Natural damaged
EMC Compliance with IEC / EN61000-6-2, IEC/ EN61000-6-4
EMI Electromagnetic Immunity: CISPR 22, FCC part 15B Class A
EMS Electromagnetic Suspension:
IEC 61000-4-2 ESD
IEC 61000-4-3 RS
IEC 61000-4-4 EFT
IEC 61000-4-5 Surge
IEC 61000-4-6 CS
IEC 61000-4-8 Pulse Magnetic Field

Environment sensor or Smart Meter reading by LoRaWAN™

WR322GR-EC-LTE-LoRaWAN gateway converts LoRaWAN™ data collected from LoRaWAN™ End nodes LR140 to MQTT and transmits to cloud through LTE network.


LoRaWAN Cloud Server on ThingsMaster OTA


The LoRaWAN data can be sent to the ThingsMaster OTA server, located in the public domain or your corporate server.  The device can be easily added and monitored on ThingsMasterOTA through the LoRaWAN gateway.  WoMaster provides a free demo account on ThingsMaster OTA for WR322GR-EC-LoRaWAN gateway.  A license for more nodes can be requested and supported.

Model Description

LoRaWAN End-Node, 4CH AI, 1 Modbus RTU 485 Host

2 x 0~10V input, 0.2% accuracy

2 x 4~20mA input, 0.3% accuracy

1 x RS485 Host, 2-wire

1 x SMA /LoRa Antenna Connector

                -EU433 433Mhz
                -EU868 868Mhz
                -US915 915Mhz
                -AS923 923Mhz
                -KR920 920Mhz
Packing & Accessories
LoRa Device x 1
Antenna x 1
Quick Installation Guide x1
Optional Order  
MDR-40-24 Din Rail Power Supply, INPUT:85-264VAC, 120-370VDC, OUTPUT: 24VDC/1.7A, -20 ~ +70℃
ThingsMaster OTA-Annual Fee-100 ThingsMaster OTA Online OTA annual fee for 100 nodes
Industrial LoRaWAN Gateway, 2GbE+2COM, LTE 2SIM, FDD B1/3/7/8/20/28A, LoRaWAN 868/433/915/923/470MHz